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Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance total | $ 8,194 | $ 8,355 | $ 8,194 | $ 8,355
Total ending loans balance | 8,198 | 8,358 | 8,198 | 8,358
Allowance For Loan Loss Allocated | 906 | 924 | 906 | 924
Average Balance in Impaired Loans total | 11,021 | 9,228 | 11,141 | 9,311
Cash/Accrual Interest Income Recognized, Total | 197 | (17) | 425 | 96
Commercial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 6,161 | 6,573 | 6,161 | 6,573
Recorded Investment With no recorded allowance | 6,165 | 6,576 | 6,165 | 6,576
Average Balance in Impaired Loans With no recorded allowance | 8,957 | 7,437 | 9,052 | 7,509
Cash/Accrual Interest Income Recognized, With no recorded allowance | 163 | (25) | 360 | 88
Unpaid Principal Balance With an allowance recorded | 2,033 | 1,782 | 2,033 | 1,782
Recorded Investment With an allowance recorded | 2,033 | 1,782 | 2,033 | 1,782
Allowance For Loan Loss Allocated | 906 | 924 | 906 | 924
Average Balance in Impaired Loans With an allowance recorded | 2,064 | 1,791 | 2,089 | 1,802
Cash/Accrual Interest Income Recognized, With an allowance recorded | 34 | 8 | 65 | 8
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 3,718 | 4,496 | 3,718 | 4,496
Recorded Investment With no recorded allowance | 3,719 | 4,490 | 3,719 | 4,490
Average Balance in Impaired Loans With no recorded allowance | 5,854 | 5,014 | 5,895 | 5,077
Cash/Accrual Interest Income Recognized, With no recorded allowance | 83 | (25) | 259 | 71
Unpaid Principal Balance With an allowance recorded | 370 | 845 | 370 | 845
Recorded Investment With an allowance recorded | 370 | 845 | 370 | 845
Allowance For Loan Loss Allocated | 3 | 145 | 3 | 145
Average Balance in Impaired Loans With an allowance recorded | 371 | 852 | 367 | 874
Cash/Accrual Interest Income Recognized, With an allowance recorded | 4 |  | 14 |
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 427 | 841 | 427 | 841
Recorded Investment With no recorded allowance | 427 | 857 | 427 | 857
Average Balance in Impaired Loans With no recorded allowance | 459 | 936 | 504 | 1,119
Cash/Accrual Interest Income Recognized, With no recorded allowance | 8 | (5) | 15 | 5
Unpaid Principal Balance With an allowance recorded | 126 | 187 | 126 | 187
Recorded Investment With an allowance recorded | 126 | 187 | 126 | 187
Allowance For Loan Loss Allocated | 35 | 30 | 35 | 30
Average Balance in Impaired Loans With an allowance recorded | 130 | 189 | 133 | 178
Cash/Accrual Interest Income Recognized, With an allowance recorded |  | 4 |  | 4
Commercial [Member] | Development & Spec Land [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 140 | 71 | 140 | 71
Recorded Investment With no recorded allowance | 140 | 69 | 140 | 69
Average Balance in Impaired Loans With no recorded allowance | 225 | 69 | 224 | 72
Cash/Accrual Interest Income Recognized, With no recorded allowance | 1 |  | 3 |
Commercial [Member] | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 1,876 | 1,165 | 1,876 | 1,165
Recorded Investment With no recorded allowance | 1,879 | 1,160 | 1,879 | 1,160
Average Balance in Impaired Loans With no recorded allowance | 2,419 | 1,418 | 2,429 | 1,241
Cash/Accrual Interest Income Recognized, With no recorded allowance | 71 | 5 | 83 | 12
Unpaid Principal Balance With an allowance recorded | 1,537 | 750 | 1,537 | 750
Recorded Investment With an allowance recorded | 1,537 | 750 | 1,537 | 750
Allowance For Loan Loss Allocated | 868 | 749 | 868 | 749
Average Balance in Impaired Loans With an allowance recorded | 1,563 | 750 | 1,589 | 750
Cash/Accrual Interest Income Recognized, With an allowance recorded | $ 30 | $ 4 | $ 51 | $ 4

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